[issue2142] difflib.unified_diff(...) produces invalid patches

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I’m not sure whether the compatibility policy would prevent that.  Aren’t there some cases with iterators (not strings) that work fine today without the change?  If so, it should be possible to get the same behavior.

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